Leon R. Glicksman is Professor of Building Technology and Mechanical Engineering at the Massachusetts Institute of Technology. He founded and served as the head of the Building Technology Program for 25 years. He has worked on fluidized beds, glass forming, natural ventilation, and sustainable design for developing countries. He is a fellow of the American Society of Mechanical Engineers (ASME) and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). He was awarded the 1970 ASME Melville Medal, the 1969 ASME Robert T. Knapp Award and the 2008 ASME Heat Transfer Memorial Award. John H. Lienhard V has been a Professor of Mechanical Engineering at the Massachusetts Institute of Technology for about 30 years, working in heat transfer, thermodynamics, fluid flow and desalination. Lienhard is a fellow of the American Society of Mechanical Engineers (ASME) and a registered professional engineer. His awards include the 1988 National Science Foundation Presidential Young Investigator Award, the 2012 ASME Technical Communities Globalization Medal, the 2015 ASME Heat Transfer Memorial Award, and several teaching awards.